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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef DOM_MEDIA_PLATFORMS_MEDIACODECSSUPPORT_H_
#define DOM_MEDIA_PLATFORMS_MEDIACODECSSUPPORT_H_
#include <array>
#include "mozilla/Atomics.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/EnumSet.h"
#include "mozilla/StaticMutex.h"
#include "nsString.h"
#include "nsTHashMap.h"
#include "nsThreadUtils.h"
namespace mozilla::media {
// List of codecs we support, used in the below macros
// to generate MediaCodec and MediaCodecSupports enums.
#define CODEC_LIST \
X(H264) \
X(VP8) \
X(VP9) \
X(AV1) \
X(Theora) \
X(AAC) \
X(FLAC) \
X(MP3) \
X(Opus) \
X(Vorbis) \
X(Wave)
// Generate MediaCodec enum with the names of each codec we support.
// Example: MediaCodec::H264
enum class MediaCodec : int {
#define X(name) name,
CODEC_LIST
#undef X
SENTINEL
};
// Helper macros used to create codec-specific SW/HW decode enums below.
#define SW_DECODE(codec) codec##SoftwareDecode
#define HW_DECODE(codec) codec##HardwareDecode
// Generate the MediaCodecsSupport enum, containing
// codec-specific SW/HW decode/encode information.
// Entries for HW audio decode/encode should never be set as we
// don't support HW audio decode/encode, but they are included
// for debug purposes / check for erroneous PDM return values.
// Example: MediaCodecsSupport::AACSoftwareDecode
enum class MediaCodecsSupport : int {
#define X(name) SW_DECODE(name), HW_DECODE(name),
CODEC_LIST
#undef X
SENTINEL
};
#undef SW_DECODE
#undef HW_DECODE
#undef CODEC_LIST // end of macros!
// Enumset containing per-codec SW/HW support
using MediaCodecsSupported = EnumSet<MediaCodecsSupport, uint64_t>;
// Codec-agnostic SW/HW decode support information.
enum class DecodeSupport : int {
Unsupported = 0,
SoftwareDecode,
HardwareDecode,
};
using DecodeSupportSet = EnumSet<DecodeSupport, uint64_t>;
// CodecDefinition stores information needed to convert / index
// codec support information between types. See: GetAllCodecDefinitions()
struct CodecDefinition {
MediaCodec codec = MediaCodec::SENTINEL;
const char* commonName = "Undefined codec name";
const char* mimeTypeString = "Undefined MIME type string";
MediaCodecsSupport swDecodeSupport = MediaCodecsSupport::SENTINEL;
MediaCodecsSupport hwDecodeSupport = MediaCodecsSupport::SENTINEL;
};
// Singleton class used to collect, manage, and report codec support data.
class MCSInfo final {
public:
// Add codec support information to our aggregated list of supported codecs.
// Incoming support info is merged with the current support info.
// This is because different PDMs may report different codec support
// information, so merging their results allows us to maintain a
// cumulative support list without overwriting any existing data.
static void AddSupport(const MediaCodecsSupported& aSupport);
// Return a cumulative list of codec support information.
// Each call to AddSupport adds to or updates this list.
// This support information can be used to create user-readable strings
// to report codec support information in about:support.
static MediaCodecsSupported GetSupport();
// Reset codec support information saved from calls to AddSupport().
static void ResetSupport();
// Query a MediaCodecsSupported EnumSet for codec-specific SW/HW support enums
// and return general support information as stored in a DecodeSupportSet.
//
// Example input:
//
// aCodec: MediaCodec::H264
// aDecode: MediaCodecsSupport {
// MediaCodecsSupport::AACSoftwareDecode
// MediaCodecsSupport::H264HardwareDecode,
// MediaCodecsSupport::H264SoftwareDecode,
// MediaCodecsSupport::VP8SoftwareDecode,
// }
//
// Example output:
//
// DecodeSupportSet {
// DecodeSupport::SoftwareDecode,
// DecodeSupport::HardwareDecode
// }
//
static DecodeSupportSet GetDecodeSupportSet(
const MediaCodec& aCodec, const MediaCodecsSupported& aSupported);
// Return codec-specific SW/HW support enums for a given codec.
// The DecodeSupportSet argument is used which codec-specific SW/HW
// support values are returned, if any.
//
// Example input:
// aCodec: MediaCodec::VP8
// aSupportSet: DecodeSupportSet {DecodeSupport::SoftwareDecode}
//
// Example output:
// MediaCodecsSupported {MediaCodecsSupport::VP8SoftwareDecode}
//
static MediaCodecsSupported GetDecodeMediaCodecsSupported(
const MediaCodec& aCodec, const DecodeSupportSet& aSupportSet);
// Generate a plaintext description for the SW/HW support information
// contained in a MediaCodecsSupported EnumSet.
//
// Example input:
// MediaCodecsSupported {
// MediaCodecsSupport::H264SoftwareDecode,
// MediaCodecsSupport::H264HardwareDecode,
// MediaCodecsSupport::VP8SoftwareDecode
// }
//
// Example output (returned via argument aCodecString)
//
// "SW H264 decode\n
// HW H264 decode\n
// SW VP8 decode"_ns
//
static void GetMediaCodecsSupportedString(
nsCString& aSupportString, const MediaCodecsSupported& aSupportedCodecs);
// Returns array of hardcoded codec definitions used to generate hashtables
// that convert between types
static std::array<CodecDefinition, 12> GetAllCodecDefinitions();
MCSInfo(MCSInfo const&) = delete;
void operator=(MCSInfo const&) = delete;
~MCSInfo() = default;
private:
MCSInfo();
static MCSInfo* GetInstance();
// Returns a codec definition by MIME type name ("media/vp9")
// or "common" name ("VP9")
static CodecDefinition GetCodecDefinition(const MediaCodec& aCodec);
UniquePtr<nsTHashMap<MediaCodecsSupport, CodecDefinition>> mHashTableMCS;
UniquePtr<nsTHashMap<const char*, CodecDefinition>> mHashTableString;
UniquePtr<nsTHashMap<MediaCodec, CodecDefinition>> mHashTableCodec;
MediaCodecsSupported mSupport;
};
} // namespace mozilla::media
namespace mozilla {
// Used for IPDL serialization.
// The 'value' has to be the biggest enum from MediaCodecsSupport.
template <typename T>
struct MaxEnumValue;
template <>
struct MaxEnumValue<media::MediaCodecsSupport> {
static constexpr unsigned int value =
static_cast<unsigned int>(media::MediaCodecsSupport::SENTINEL);
};
} // namespace mozilla
#endif /* MediaCodecsSupport_h_ */
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